函数快速排序

namespace ConsoleApplication10
{
    class Program
    {    
        public double[] paixu(double[] a)
        {
            double temp;
            for (int i = 0; i < a.Length; i++)
            {
                for (int j = i; j < a.Length - 1; j++)
                {
                    if (a[i] < a[j + 1])
                    {
                        temp = a[i];
                        a[i] = a[j + 1];
                        a[j + 1] = temp;
                    }
                }
            }
            return a;
        }
        static void Main(string[] args)
        {
            double[] a = new double[5];            
            for (int i = 0; i < a.Length; i++)
            {
                a[i] = Convert.ToInt32(Console.ReadLine());
            }
            Console.WriteLine(a);
            new Program().paixu(a);
            for (int i = 0; i <a.Length; i++)
            {
                Console.WriteLine(a[i]);
            } 
            Console.ReadLine();
        }
    }
}